Technical Blog

What does LVDT Stand For?

LVDT stands for Linear Variable Differential Transformer.

LVDTs are a sensor used to monitor linear displacement. They convert the linear motion of an object into an electrical signal.

Working principle of an LVDT

LVTDs are constructed of a primary coil, one or two secondary coils, a ferromagnetic core (or slug), a housing – usually stainless steel.

The ferromagnetic core moves in a linear motion inside the device and is connected to a moving object. The applied voltage in the coils along with the magnetic flux being produced enables the position of the core to be detected and measured thus, giving a precise measurement of linear displacement. 

LVDTs are either AC based, or DC based.

LVDT Applications

As LVDTs are a type of linear position sensor, they have many uses and are commonly found across various industries.

Some of the more common applications they are frequently used for are;

  • Positional feedback applications
  • Wire-die bonding machines
  • Materials testing
  • Structural Monitoring
  • Data collection applications
  • Process and control applications
  • General industrial applications
  • Servomechanisms
  • Power turbines
  • Hydraulic applications
  • Automation
  • Aircraft applications
  • Renewable energy

LVDT Advantages

An LVDT is just one of the different types of linear position sensors available on the market today. LVDTs are non-contact and this gives them many advantages over other products. Some of these advantages are;

Minimal Friction – because they are non-contacting devices, there is minimal friction within the LVDT, this means there is less wear and tear. Minimal friction allows an LVDT to have;

  • Long life
  • Unlimited mechanical life
  • Outstanding repeatability

High Accuracy - LVDTs can measure the smallest changes in position. They are suitable for measurements from a millionth of an inch up to around 30 inches depending on the device selected.

Quick Response Time - LVDTs offer a quick response time compared to some alternative measuring solutions.

Rugged and Robust – LVDTs are durable and well suited to harsh environments.

Wide Operating Temperature Range – LVDTs can operate in a wide temperature range. This is another factor enabling them to work in a variety of environments.

Our LVDTs

Our range of LVDTs come from our partner TE Connectivity. These are available as AC or DC. Browse our LVDTs on our website.

For an alternative measuring solution or to compare various position sensor technology look at our blog post Non-Contact Sensor Technologies

Contact us to discuss your application or for more information on the LVDTs and similar devices that we can offer. 

Article published on: 26/10/2020